1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CONTENT_COMMON_GPU_MEDIA_ANDROID_VIDEO_DECODE_ACCELERATOR_H_
6 #define CONTENT_COMMON_GPU_MEDIA_ANDROID_VIDEO_DECODE_ACCELERATOR_H_
14 #include "base/compiler_specific.h"
15 #include "base/threading/thread_checker.h"
16 #include "base/timer/timer.h"
17 #include "content/common/content_export.h"
18 #include "content/common/gpu/media/video_decode_accelerator_impl.h"
19 #include "gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.h"
20 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
21 #include "media/base/android/media_codec_bridge.h"
22 #include "media/video/video_decode_accelerator.h"
29 // A VideoDecodeAccelerator implementation for Android.
30 // This class decodes the input encoded stream by using Android's MediaCodec
31 // class. http://developer.android.com/reference/android/media/MediaCodec.html
32 class CONTENT_EXPORT AndroidVideoDecodeAccelerator
33 : public VideoDecodeAcceleratorImpl {
35 // Does not take ownership of |client| which must outlive |*this|.
36 AndroidVideoDecodeAccelerator(
37 const base::WeakPtr<gpu::gles2::GLES2Decoder> decoder,
38 const base::Callback<bool(void)>& make_context_current);
40 // media::VideoDecodeAccelerator implementation.
41 virtual bool Initialize(media::VideoCodecProfile profile,
42 Client* client) OVERRIDE;
43 virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
44 virtual void AssignPictureBuffers(
45 const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
46 virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
47 virtual void Flush() OVERRIDE;
48 virtual void Reset() OVERRIDE;
49 virtual void Destroy() OVERRIDE;
57 static const base::TimeDelta kDecodePollDelay;
59 virtual ~AndroidVideoDecodeAccelerator();
61 // Configures |media_codec_| with the given codec parameters from the client.
62 bool ConfigureMediaCodec();
64 // Sends the current picture on the surface to the client.
65 void SendCurrentSurfaceToClient(int32 bitstream_id);
67 // Does pending IO tasks if any. Once this is called, it polls |media_codec_|
68 // until it finishes pending tasks. For the polling, |kDecodePollDelay| is
72 // Feeds input data to |media_codec_|. This checks
73 // |pending_bitstream_buffers_| and queues a buffer to |media_codec_|.
76 // Dequeues output from |media_codec_| and feeds the decoded frame to the
80 // Notifies the client that initialize was completed.
81 void NotifyInitializeDone();
83 // Requests picture buffers from the client.
84 void RequestPictureBuffers();
86 // Notifies the client about the availability of a picture.
87 void NotifyPictureReady(const media::Picture& picture);
89 // Notifies the client that the input buffer identifed by input_buffer_id has
91 void NotifyEndOfBitstreamBuffer(int input_buffer_id);
93 // Notifies the client that the decoder was flushed.
94 void NotifyFlushDone();
96 // Notifies the client that the decoder was reset.
97 void NotifyResetDone();
99 // Notifies about decoding errors.
100 void NotifyError(media::VideoDecodeAccelerator::Error error);
102 // Used to DCHECK that we are called on the correct thread.
103 base::ThreadChecker thread_checker_;
105 // To expose client callbacks from VideoDecodeAccelerator.
108 // Callback to set the correct gl context.
109 base::Callback<bool(void)> make_context_current_;
111 // Codec type. Used when we configure media codec.
112 media::VideoCodec codec_;
114 // The current state of this class. For now, this is used only for setting
118 // This map maintains the picture buffers passed to the client for decoding.
119 // The key is the picture buffer id.
120 typedef std::map<int32, media::PictureBuffer> OutputBufferMap;
121 OutputBufferMap output_picture_buffers_;
123 // This keeps the free picture buffer ids which can be used for sending
124 // decoded frames to the client.
125 std::queue<int32> free_picture_ids_;
127 // Picture buffer ids which have been dismissed and not yet re-assigned. Used
128 // to ignore ReusePictureBuffer calls that were in flight when the
129 // DismissPictureBuffer call was made.
130 std::set<int32> dismissed_picture_ids_;
132 // The low-level decoder which Android SDK provides.
133 scoped_ptr<media::VideoCodecBridge> media_codec_;
135 // A container of texture. Used to set a texture to |media_codec_|.
136 scoped_refptr<gfx::SurfaceTexture> surface_texture_;
138 // The texture id which is set to |surface_texture_|.
139 uint32 surface_texture_id_;
141 // Set to true after requesting picture buffers to the client.
142 bool picturebuffers_requested_;
144 // The resolution of the stream.
147 // Encoded bitstream buffers to be passed to media codec, queued until an
148 // input buffer is available, along with the time when they were first
150 typedef std::queue<std::pair<media::BitstreamBuffer, base::Time> >
151 PendingBitstreamBuffers;
152 PendingBitstreamBuffers pending_bitstream_buffers_;
154 // Keeps track of bitstream ids notified to the client with
155 // NotifyEndOfBitstreamBuffer() before getting output from the bitstream.
156 std::list<int32> bitstreams_notified_in_advance_;
158 // Owner of the GL context. Used to restore the context state.
159 base::WeakPtr<gpu::gles2::GLES2Decoder> gl_decoder_;
161 // Used for copy the texture from |surface_texture_| to picture buffers.
162 scoped_ptr<gpu::CopyTextureCHROMIUMResourceManager> copier_;
164 // Repeating timer responsible for draining pending IO to the codec.
165 base::RepeatingTimer<AndroidVideoDecodeAccelerator> io_timer_;
167 friend class AndroidVideoDecodeAcceleratorTest;
170 } // namespace content
172 #endif // CONTENT_COMMON_GPU_MEDIA_ANDROID_VIDEO_DECODE_ACCELERATOR_H_